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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments, at cost | $ 26,654 | $ 26,661
State tax credits, held for sale, including $0 and $400 carried at fair value, respectively | $ 37,587 | 43,468
State tax credit term | 10 years |
Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State tax credits, held for sale, including $0 and $400 carried at fair value, respectively | $ 37,600 |
Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State Tax Credits Held For Sale, Fair Value Disclosure |  | 400
Portion at Other than Fair Value, Fair Value Disclosure |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other Investments, Fair Value Disclosure | 26,600 |
Estimated fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State Tax Credits Held For Sale, Fair Value Disclosure | 39,169 | 44,271
Estimated fair value | Recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
State Tax Credits Held For Sale, Fair Value Disclosure |  | 400
State tax credits held for sale, at fair value | Recurring basis | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Change in unrealized (losses) gains relating to assets still held at the reporting date | $ 0 | $ 885

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